Genetically more closely related to animals than to plants, fungi constitute the third kingdom of eukaryotic organisms. Essential to terrestrial ecosystems, they facilite wood decay and form mycorrhizal symbioses with autotrophic plants. Accurate knowledge on fungus distributional ranges, however, may be hampered by overestimations due to broad species delimitations.
Using genetically defined operational taxonomic units (OTUs) from the UNITE database, this study by Canadian researchers attempts to improve this knowledge by analysing global data from 12 mushroom-forming fungus genera. They augmented this dataset by sampling 600+ mushroom specimens found in Washington and British Columbia.
As many OTU records lack precise locality data, the authors used country centroids to estimate ranges—a methodology they verified by comparing estimated range extents with GBIF-mediated occurrences of species of four well-studied three genera.
The overall results put the median range extent of mushroom OTUs at 1,200 to 4,039 km and suggest a biogeopgraphic structure as opposed to global distributions—of mushroom-forming fungi.